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J-. HOPE. V TooL HQLDER.` No. 502,039. Patented July 25, 1893.

uw 1r 'JNMENZ'UHI l UNrrED STATES PATENT QEErOE.

JOHN HOPE, OE PROVIDENCE, RHODE ISLAND.

TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 502,039, dated July 25, 1893.

Application filed October 18, 1892.

To a/ZZ whom it may concern:

Be it known that I, JOHN HOPE, of the city of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Tool- Holders; and I hereby declare that the follow` ing is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specifcation.

This invention has reference to improvements in tool-holders which are especially adapted for use on pantograph engravingmachines. A

The object of the invention is to produce a tool-holder which will be extensible in a circular direction.

The further object of the invention is to produce a tool-holder for pantograph engravingmachines which will have an offset pivoted tool-support.

The invention consists in the peculiar construction of the extensible tool-holder and the combination therewith of the novel features of construction and combination of parts which will hereinafter be more fully described and pointed out in the claims.

Figure 1 represents a side view of the improved toOl-holder. Fig. 2 represents a plan view of the same. Fig. 3 represents an enlarged cross-sectional view through the holder and eXtensible-arm, the securing-screw being shown in full. Fig. 4 represents a similar view through the end of the eXtensible-arm and the pivoted tool-support.

Similar numbers of reference designate corresponding parts throughout.

The term tool, as herein used, is supposed to be the engraving-device or diamondpoint carried, bymeans of which a pattern is traced through the varnished or coated surface of a printing-cylinder held in a pantographic engraving-machine.

In the drawings 5 indicates the rear extension of the tool-holder furnished with the pivoted-plates 6 on the upper rear edge of which the depressor-bar of the pantograph engraving-machine works to depress this portion of the tool-holder and to elevate the forward end thereof carrying the engraving-tool, the plate 6 being adjusted by means of the thumbscrew 7 vwhich is engaged in a threaded per- Serial No1 44.9.226- (No model.)

foration in the extension 5 and bears against the forward end of the plate 6.

The extension 5 is connected with the mainarm 8 by the diagonal-member 9. At the j unction of this member with the extension islocated the fulcrum-pin 10 having a rounded end which, when in use, rests in a V-shaped slot in the supporter-rail of the engravingmachine, and at the junction of the member 9 and the arm 8 is located the fulcrum-pin 11 having a conical end which is adapted to rest in a depression of an adj ustable-plate carried by the supporter-rail.

The main-arm 8, curved as shown in Fig. 1 of the drawings, has a vertical longitudinalslot 12, and in its lower surface is formed a longitudinal-guide in which the rib 13 of the extensible-arm 14 is held by the clamping-screw 15,the threaded portion of which engages with threaded perforations in the arm 14:.

The forward end of the eXtensible-arm 14 vis furnished with the enlargement 16 which is transversely perforated and provided with the set-screw 17 by means of which the shank 18 of the offset tool-clamp 19 is secured at any desired angle with the copper roll to be sition in front Ofand in a line with a second the surface of the roll which is being engraved.

Having 'thus described my invention, I claim as new and desire to secure by Letters Patentl. A tool-support, for pantograph engraving-machines, having a laterally offset toolclamp.

2. A tool-support, for pantograph engrav- Ico ing-machines, having an arm extensible on the radius of a circle and carrying alaterally offset tool-holder.

3. The combination With a tool-holder, for engraving;` machines, of the extension 5, the plate G pivoted to said extension, and the thumb-screw 7 carried by said extension and adapted to bear on the forward end of the plate 6.

4. The combination with a tool-holder hav-` ing a curved-arm S and an extensible-arm 14 carried thereby, of an offset tool-support carried on the end of the arm 14 and adjustable laterally and radially.

5. In a tool-holder, for pantograph engraving-machines, the combination with a curved supporting-arm, of a tool-clamp carried thereby and adjustable laterally and radially.

G. The combination, in a tool-holder, with the extension 5 and the slotted-arm S connected bythe diagonal-memberi), the plate 6 pivoted to the extension, and the screw 7 for adjusting the salue, of the extensible-arm 14 secured to the arm by the clamping-screw 15, the transverse perforated-enlargement 16 provided With the set-screw 17 on the end of the arm 14, and the clamp 19 having the shank 18 adapted to be secured in the transverse perforation of the enlargement 16, as and for the purpose described.

In Witness whereof I have hereunto set my hand.

JOI-IN HOPE. VVitnesses:

M. F. BLIGH, H. J. MILLER. 

